Oscillation-Mark Formation and Liquid-Slag Consumption in Continuous Casting Mold

Yang, Jie; Meng, Xiang‐Guo; Wang, Ning; Zhu, Miaoyong

doi:10.1007/s11663-016-0880-x

Cited by 17 publications

(13 citation statements)

References 27 publications

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“…Previous work has confirmed that the internal pressure of the liquid slag is caused by the continuous flow in the flux channel during oscillation process of the mold. 22) The mold movement is sufficient to create a nonuniform pressure flow and the presence of the slag rim can greatly enhance this pressure flow (i.e. pumping effect) in the vicinity of the meniscus even though the slag rim does not interact with the initial shell tip directly.…”

Section: Oscillation Behaviorsmentioning

confidence: 99%

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

2018

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A computational model of the continuous casting process has been developed, which includes transient heat transfer, multiphase flow, solidification, and mold oscillation. Succeeding the previous report on the evolution phenomena in the mold, this article describes fluctuations in the pressure, heat flux, and slag films during the oscillation cycle and the coupling effect of these variables on slag flow and shell growth. The results show that the predicted flux pressure is decided by the combined effect of mold velocity and liquid film thickness. The presence of slag rim enhances the nonuniform pressure flow near the meniscus during mold oscillation. Increases in pressure and heat flux occur in the negative strip time while the mold and slag rim move downwards approaching the lowest position, which squeezes the slag flow to be divided into two tributaries, promoting the slag infiltration and the initial shell solidification. Negative consumption rate is identified partly in the cycle based on the velocity distributions of liquid slag. The model provides quantitative analysis regarding the influence of meniscus shape and slag films related to the casting speed on slag consumption and oscillation mark formation.

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Section: Oscillation Behaviorsmentioning

confidence: 99%

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

2018

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“…The molten steel initially solidifies at the meniscus, where the heat flux and fluid flow behaviors determine the ultimate quality of the steel [1,2]. Some numerical models focusing on the phenomenon in the meniscus region assumed the constant meniscus profile based on the classic Bikerman equation [3][4][5][6]. Okazawa and Kajitani [7,8] simplified the flux channel between the mold wall and the solidified shell into a non-parallel channel to clarify the effect of mold oscillation on the slag infiltration.…”

Section: Introductionmentioning

confidence: 99%

Melting and Flowing Behavior of Mold Flux in a Continuous Casting Billet Mold for Ultra-High Speed

Yang

Chen

Qin³

et al. 2020

Metals

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High casting speed coincides with the development trend of billet continuous casting, which significantly changes the casting characteristics. A mathematical model of the billet mold, which includes multiphase fluid flow, transient heat transfer, and solidification during ultra-high speed of the casting process was developed. The model is first applied to investigate the flow field of molten steel in the mold, studying the influence of steel flow upon the melting and flowing behavior of mold flux. The temperature and velocity distributions of the flux pool that formed above the molten steel surface are described. A parametric study on the melting temperature and viscosity of mold flux on liquid flux thickness and flow velocity is then carried out. Finally, the model is used to derive the relationship between interfacial tension and level fluctuations. The predictions provide an improved understanding of the melting and flowing behavior of mold flux in the billet mold and give the guidance for the design and optimization of mold flux for ultra-high speed of billet casting.

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“…The amount of Al 2 O 3 in the mold flux increased from 3 to 25 mass%, and even above 30 mass%, due to this reaction . The accumulation of Al 2 O 3 in the liquid slag pool significantly deteriorates physicochemical properties of the mold flux, such as viscosity, melting temperature, and crystallization ability, which worsens the lubrication and heat‐extraction conditions, and causes poor quality slabs . In addition, the occurrence of this interfacial reaction is reported to influence the wetting behavior between the slag and steel .…”

Section: Introductionmentioning

confidence: 99%

Effect of Interfacial Reaction between CaO–BaO–Al₂O₃‐Based Mold Fluxes and High‐Mn–High‐Al Steels on Fundamental Properties and Lubrication of Mold Flux

Yan

Yuan

Zhang

et al. 2020

steel research int.

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Contact experiments between low‐reactivity CaO–BaO–Al2O3‐based mold fluxes, F1 and F2, and 1.4–2.2 mass% of Al‐containing steels are conducted to investigate the effect of interfacial reaction on mold flux properties and the ultimate limit of reaction duration capacity of the developed mold flux. F1 contains 30.76% CaO, 17.03% Al2O3, 13.40% BaO, and 10.70% SiO2, whereas F2 consists of 27.90% CaO, 23.60% Al2O3, 12.90% BaO, and 9.57% SiO2 of the mass. The pre‐ and post‐experimental wettability of slag samples on steel substrates and the lubrication behavior of slags are discussed. The main results reveal that SiO2, Na2O, and B2O3 in the mold flux react with [Al] in the molten steel at steel–slag interface. The variations in slag properties indicate that both reaction durations between F1 reacting with twinning‐induced plasticity (TWIP) and F2 reacting with 20Mn23AlV steel can last for 40 min, whereas F2 has wider potential applicability for the continuous casting of Al‐containing steels. Interfacial reaction deteriorates the wettability of slag F2 on 20Mn23AlV steel substrate and reduces slag consumption, as equilibrium contact angle increases from approximately 3° to 37°, but slag consumption prediction is 0.22 kg m−2, which is likely to meet the requirement for lubrication.

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Oscillation-Mark Formation and Liquid-Slag Consumption in Continuous Casting Mold

Cited by 17 publications

References 27 publications

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

Melting and Flowing Behavior of Mold Flux in a Continuous Casting Billet Mold for Ultra-High Speed

Effect of Interfacial Reaction between CaO–BaO–Al₂O₃‐Based Mold Fluxes and High‐Mn–High‐Al Steels on Fundamental Properties and Lubrication of Mold Flux

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Oscillation-Mark Formation and Liquid-Slag Consumption in Continuous Casting Mold

Cited by 17 publications

References 27 publications

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

Transient Thermo-fluid and Solidification Behaviors in Continuous Casting Mold: Oscillation Behaviors

Melting and Flowing Behavior of Mold Flux in a Continuous Casting Billet Mold for Ultra-High Speed

Effect of Interfacial Reaction between CaO–BaO–Al2O3‐Based Mold Fluxes and High‐Mn–High‐Al Steels on Fundamental Properties and Lubrication of Mold Flux

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Product

Resources

About

Effect of Interfacial Reaction between CaO–BaO–Al₂O₃‐Based Mold Fluxes and High‐Mn–High‐Al Steels on Fundamental Properties and Lubrication of Mold Flux